And which unit will you officially recommend to markets to avoid chaos?
1 mega-iota (1 million) as the base unit looks pretty good to me. We will have 2,779,530,283 mega-iota which is 2.7795 times of the old iota. The one mega-iota's price will be the current old iota price divided by 2.7795. For instance, if the current old iota's price is 2000 satoshi, the new one mega-iota's price is 2000/2.7795=720 satoshi.